/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.core.Configurable;
import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;
import org.jpos.iso.ISOChannel;
import org.jpos.iso.ISOException;
import org.jpos.iso.ISOMsg;
import org.jpos.iso.ISOPackager;
import org.jpos.util.LogEvent;
import org.jpos.util.LogSource;
import org.jpos.util.Logger;
import org.jpos.util.NameRegistrar;

import java.io.IOException;
import java.util.List;
import java.util.Vector;

@SuppressWarnings("unchecked")
public class ChannelPool implements ISOChannel, LogSource, Configurable, Cloneable {
	boolean usable = true;
	String name = "";
	protected Logger logger;
	protected String realm;
	Configuration cfg = null;
	List pool;
	ISOChannel current;

	public ChannelPool() {
		super();
		pool = new Vector();
	}

	public void setPackager(ISOPackager p) {
		// nothing to do
	}

	public synchronized void connect() throws IOException {
		current = null;
		LogEvent evt = new LogEvent(this, "connect");
		evt.addMessage("pool-size=" + Integer.toString(pool.size()));
		for (int i = 0; i < pool.size(); i++) {
			try {
				evt.addMessage("pool-" + Integer.toString(i));
				ISOChannel c = (ISOChannel) pool.get(i);
				c.connect();
				if (c.isConnected()) {
					current = c;
					usable = true;
					break;
				}
			} catch (IOException e) {
				evt.addMessage(e);
			}
		}
		if (current == null)
			evt.addMessage("connect failed");
		Logger.log(evt);
		if (current == null) {
			throw new IOException("unable to connect");
		}
	}

	public synchronized void disconnect() throws IOException {
		current = null;
		LogEvent evt = new LogEvent(this, "disconnect");
		for (Object aPool : pool) {
			try {
				ISOChannel c = (ISOChannel) aPool;
				c.disconnect();
			} catch (IOException e) {
				evt.addMessage(e);
			}
		}
		Logger.log(evt);
	}

	public synchronized void reconnect() throws IOException {
		disconnect();
		connect();
	}

	public synchronized boolean isConnected() {
		try {
			return getCurrent().isConnected();
		} catch (IOException e) {
			return false;
		}
	}

	public ISOMsg receive() throws IOException, ISOException {
		return getCurrent().receive();
	}

	public void send(ISOMsg m) throws IOException, ISOException {
		getCurrent().send(m);
	}

	public void send(byte[] b) throws IOException, ISOException {
		getCurrent().send(b);
	}

	public void setUsable(boolean b) {
		this.usable = b;
	}

	public void setName(String name) {
		this.name = name;
		NameRegistrar.register("channel." + name, this);
	}

	public String getName() {
		return this.name;
	}

	public ISOPackager getPackager() {
		return null;
	}

	public void setLogger(Logger logger, String realm) {
		this.logger = logger;
		this.realm = realm;
	}

	public String getRealm() {
		return realm;
	}

	public Logger getLogger() {
		return logger;
	}

	public synchronized void setConfiguration(Configuration cfg)
			throws ConfigurationException {
		this.cfg = cfg;
		String channelName[] = cfg.getAll("channel");
		for (String aChannelName : channelName) {
			try {
				addChannel(aChannelName);
			} catch (NameRegistrar.NotFoundException e) {
				throw new ConfigurationException(e);
			}
		}
	}

	public void addChannel(ISOChannel channel) {
		pool.add(channel);
	}

	public void addChannel(String name)
			throws NameRegistrar.NotFoundException {
		pool.add(NameRegistrar.get("channel." + name));
	}

	public void removeChannel(ISOChannel channel) {
		pool.remove(channel);
	}

	public void removeChannel(String name) throws NameRegistrar.NotFoundException {
		pool.remove(NameRegistrar.get("channel." + name));
	}

	public int size() {
		return pool.size();
	}

	public synchronized ISOChannel getCurrent() throws IOException {
		if (current == null)
			connect();
		else if (!usable)
			reconnect();

		return current;
	}

	public Object clone() {
		try {
			return super.clone();
		} catch (CloneNotSupportedException e) {
			throw new InternalError();
		}
	}
}

